Study on Mechanisms of Ultrasonic Cavitation Erosion of Meta
发布时间：2021-09-08 14:34
运行稳定性和安全性对于发电厂、水下航行器等与流体相关的工业装置极为关键。在这些系统或装置中,当管道、阀门和过流部件工作时,经常会遭遇空化现象。空化泡溃灭后释放巨大的能量,会逐渐破坏相关的部件,即发生空蚀;空蚀引起质量损失和装置运行效率的下降,严重时导致部件断裂和流程运行中断。为确保流体输送和流体装置的安全运行,必须提高相关部件的抗空蚀能力。为达到这一目的,一方面对相关部件的结构进行优化设计,另一方面对材料进行空蚀性能研究。本研究就是针对过流部件常用的金属材料进行超声空蚀机理研究,综合评估这些材料的抗空蚀性能。本文的主要工作及结论如下:（1）根据ASTM G32国际标准,搭建了超声空蚀实验台,对不同材料进行。超声空蚀实验。选择了三种液体,即去离子水、Na2SO4和NaHCO3溶液,用于研究液体介质对超声空蚀的影响。选择的介质温度范围为15–60 oC。实验中考虑超声换能器头部和试样表面之间的距离（靶距）对空蚀的影响。设计了测量方案,对空蚀试样的累积质量损失、微观硬度和残余应力进行测量,用扫描电子显微镜...
【文章来源】：江苏大学江苏省
【文章页数】：150 页
【学位级别】：博士
【文章目录】：
DEDICATION
Abstract
摘要
List of Symbols
Chapter1 Introduction
1.1 Background
1.2 Causes of cavitation
1.3 Erosion development with exposure time
1.4 Operation parameters influencing cavitation erosion
1.5 Summary of research gaps
1.6 The purpose of the study
Chapter2 Experimental setup and methods for cavitation
2.1 Introduction
2.2 Experimental techniques for cavitation erosion
2.3 Experimental methods for cavitation erosion test
2.4 Ultrasonic cavitation erosion experimental rig
2.5 Summary
Chapter3 Comparative investigation of ultrasonic erosion for three materials in deionized water
3.1 Introduction
3.2 Experimental approach
3.3 Experimental materials and properties
3.4 Comparison of ultrasonic cavitation of selected materials
3.5 Summary
Chapter4 Effects of liquid medium on ultrasonic cavitation erosion of copper alloy
4.1 Introduction
4.2 Experimental approach
4.3 Effects of liquid medium on the cavitation erosion
4.4 Summary
Chapter5 Effects of the concentration of NaHCO3 solution on cavitation erosion of copper alloy
5.1 Introduction
5.2 Experimental approach
5.3 Results and discussion
5.4 Summary
Chapter6 Effects of liquid medium temperature on the cavitation erosion of CuZnAl shape memory alloy
6.1 Introduction
6.2 Experimental approach
6.3 Properties of CuZnAl shape memory alloy
6.4 Results and discussion
6.5 Discussion on mechanisms of cavitation erosion
6.6 Summary
Chapter7 Effects of standoff distance on cavitation erosion of CuZnAl shape memory alloy
7.1 Introduction
7.2 Experimental approach
7.3 Results and discussion
7.4 Summary
Chapter8 Conclusions and prospect
8.1 Major work and conclusions
8.2 Recommendations for future work
References
Acknowledgements
Publications
本文编号：3390959
【文章来源】：江苏大学江苏省
【文章页数】：150 页
【学位级别】：博士
【文章目录】：
DEDICATION
Abstract
摘要
List of Symbols
Chapter1 Introduction
1.1 Background
1.2 Causes of cavitation
1.3 Erosion development with exposure time
1.4 Operation parameters influencing cavitation erosion
1.5 Summary of research gaps
1.6 The purpose of the study
Chapter2 Experimental setup and methods for cavitation
2.1 Introduction
2.2 Experimental techniques for cavitation erosion
2.3 Experimental methods for cavitation erosion test
2.4 Ultrasonic cavitation erosion experimental rig
2.5 Summary
Chapter3 Comparative investigation of ultrasonic erosion for three materials in deionized water
3.1 Introduction
3.2 Experimental approach
3.3 Experimental materials and properties
3.4 Comparison of ultrasonic cavitation of selected materials
3.5 Summary
Chapter4 Effects of liquid medium on ultrasonic cavitation erosion of copper alloy
4.1 Introduction
4.2 Experimental approach
4.3 Effects of liquid medium on the cavitation erosion
4.4 Summary
Chapter5 Effects of the concentration of NaHCO3 solution on cavitation erosion of copper alloy
5.1 Introduction
5.2 Experimental approach
5.3 Results and discussion
5.4 Summary
Chapter6 Effects of liquid medium temperature on the cavitation erosion of CuZnAl shape memory alloy
6.1 Introduction
6.2 Experimental approach
6.3 Properties of CuZnAl shape memory alloy
6.4 Results and discussion
6.5 Discussion on mechanisms of cavitation erosion
6.6 Summary
Chapter7 Effects of standoff distance on cavitation erosion of CuZnAl shape memory alloy
7.1 Introduction
7.2 Experimental approach
7.3 Results and discussion
7.4 Summary
Chapter8 Conclusions and prospect
8.1 Major work and conclusions
8.2 Recommendations for future work
References
Acknowledgements
Publications
本文编号：3390959
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